Pressure-control apparatus



' I 1618,1'09 Feb. 15,1927. c. A. SABBAH I PRESSURE CONTROL APPARATUSFiled July 21. 1926 lnvehh or Camille A. scbbah Hi s Ahedme umrsn STATcnn'nmi: a-sannan, or scnnmrcranv, new Yonm-Assmnon. 'ro GENERAL comm, aconronncrron or NEW roan.

ES PATENT OFFWB n nncrnrc 1:nnssUnE-.ooNrnoL APPARATUS.

. pplication filed July 2 1 .1926. serial no; 124,074.

:My invention relates to apparatus at. .producing or maintaining apredetermined vapor pressure. within a vessel', and' has for itsprincipal object the provision of an iInuse of gears, springs or othermechanical elements and are incapable of automatically closing theentrance to vessel when the pressure control device ceases to function.In accordance with my invention, these difliculties are avoided by theprovision of a liquid,

seal which is o ened and closed in response to operation 0 thepressure,control device. My inventionzwill 'be better understood from thefollowing description when considered in connection with theaccompanyout in the a pended claims.

The draw1ng shows a pressure control apparatus wherem my invention hasbeen e'mbodied. I

This apparatus comprises a pressure control means, shown as a pump1,-which is connected to -apipe 2- -through avalve or sealing meanscomprising pipes 3, 4, 5 and 6 and a sealed chamber 7 which contains aliquidsuchas mercury or the like. The pipe 2 is connected to" the vesselcontaining the vapor which is to have its pressure controlled." Thevertical Ppart of pipe 2 is at least inches in'lengt v cury fromg'ettinginto the vacuum chamber.

In explaining the'operation of the appa-- ratus it will be assumed thatgas is to be with raw'n from the vessel through the pas' For thispurpose, the'pipe 6 is connected to thelow' pressure side of the pump 1and the pipe 5 is connectedto the pump 1'at a po nt intermediatebetween'its low pressure slde 59 and its exhaust,- this point beingso chosenthat the upper surfaces of'the liquid in pipes 2 and 6 are maintained intheir illustrated drawing and its scope will be pointed to prevent themer- 1n sageway formed by thepipes 2,.3 and 6.

.When the pump ceases'to function, however, atmospheric pressureisapplied to the surwithin the'pipe 6 and the liquid rises within thepipe-2 to a point at which the end of the v pipe 3 is closed and theingress of airor vapor through the p1pe'2 to the. .essel is positionswhen the pump 1 is operating.

.-faces of the l quid within the chamber 7and prevented. The entrance,to the vessel is] thus sealed at all times when .vapor is not beingwithdrawn from it and this result is effected without the use ofmechanical devices likely to be unsatisfactory in'their operation;

trated and described herein has been select ed for the purpose ofclearly settingforththe principles involved. It will be apparenthowe'ver, that the invention is susceptible of being modified to meetthe difierent conditions encountered'in its'use and Ithere'fore aimtocover by the appended claims all modifications within the true 'sipirtand scope .of my invention.

What I claim as new and desire to secure 1. The combination of vaporpressure con trol; means provided with low andintermediate' pressureopenings, means forming) a passageway interconnected. with said controlThe embodimentnof the invention illusby Letters Patent'of the UnitedStates, is

passageway for causing said passageway to be closed in response to apredetermined Bchange in the relation between the-pressuresat said lowand intermediate pressure open- The combination of vapor pressurecontrol means provided with low and intermediate pressure openings,means. forming a passageway interconnected with said control meansthrough said lowpressure opening,

nected with said control means through said intermediate pressureopening, a 'li uid .within said chamber, anda pipe exten ing betweensaid liquid and said passageway whereby said liquid is. causedto closesaid means forming a sealed chamber interconpassageway in response to' apredetermineq change in the relation between the at said low andintermediate openings. v v 3. The combination'of a pump provided 5 withaninlet and outletymeanslforming a,

passageway interconnected with said pump through said inlet, meansforming a sealed chamber inte'rconnected withsaid pump at pressurespressure a point intermediate said inlet and outlet, and meansinterposed between said chamber and said passageway for causing saidpasto functidm' myhan d. this 20th day of July, 1926.

- .QAMILLE A. SABBAH;

sageway to be closed when saidpump ceases

